# -*- coding: utf-8 -*- # # Copyright (C) 2015 GNS3 Technologies Inc. # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . """ Represents a uBridge hypervisor and starts/stops the associated uBridge process. """ import sys import os import subprocess import asyncio import socket import re from gns3server.utils import parse_version from gns3server.utils.asyncio import wait_for_process_termination from gns3server.utils.asyncio import subprocess_check_output from .ubridge_hypervisor import UBridgeHypervisor from .ubridge_error import UbridgeError import logging log = logging.getLogger(__name__) class Hypervisor(UBridgeHypervisor): """ Hypervisor. :param project: Project instance :param path: path to uBridge executable :param working_dir: working directory :param host: host/address for this hypervisor :param port: port for this hypervisor """ _instance_count = 1 def __init__(self, project, path, working_dir, host, port=None): if port is None: try: port = None info = socket.getaddrinfo(host, 0, socket.AF_UNSPEC, socket.SOCK_STREAM, 0, socket.AI_PASSIVE) if not info: raise UbridgeError("getaddrinfo returns an empty list on {}".format(host)) for res in info: af, socktype, proto, _, sa = res # let the OS find an unused port for the uBridge hypervisor with socket.socket(af, socktype, proto) as sock: sock.bind(sa) port = sock.getsockname()[1] break except OSError as e: raise UbridgeError("Could not find free port for the uBridge hypervisor: {}".format(e)) super().__init__(host, port) self._project = project self._path = path self._working_dir = working_dir self._command = [] self._process = None self._stdout_file = "" self._started = False self._version = "" @property def process(self): """ Returns the subprocess of the Hypervisor :returns: subprocess """ return self._process @property def started(self): """ Returns either this hypervisor has been started or not. :returns: boolean """ return self._started @property def path(self): """ Returns the path to the uBridge executable. :returns: path to uBridge """ return self._path @path.setter def path(self, path): """ Sets the path to the uBridge executable. :param path: path to uBridge """ self._path = path @property def version(self): """ Returns the uBridge version. :returns: string """ return self._version @asyncio.coroutine def _check_ubridge_version(self): """ Checks if the ubridge executable version """ try: output = yield from subprocess_check_output(self._path, "-v", cwd=self._working_dir) match = re.search("ubridge version ([0-9a-z\.]+)", output) if match: self._version = match.group(1) if parse_version(self._version) < parse_version("0.9.7"): raise UbridgeError("uBridge executable version must be >= 0.9.7") else: raise UbridgeError("Could not determine uBridge version for {}".format(self._path)) except (OSError, subprocess.SubprocessError) as e: raise UbridgeError("Error while looking for uBridge version: {}".format(e)) @asyncio.coroutine def start(self): """ Starts the uBridge hypervisor process. """ yield from self._check_ubridge_version() env = os.environ.copy() if sys.platform.startswith("win"): # add the Npcap directory to $PATH to force uBridge to use npcap DLL instead of Winpcap (if installed) system_root = os.path.join(os.path.expandvars("%SystemRoot%"), "System32", "Npcap") if os.path.isdir(system_root): env["PATH"] = system_root + ';' + env["PATH"] try: command = self._build_command() log.info("starting ubridge: {}".format(command)) self._stdout_file = os.path.join(self._working_dir, "ubridge.log") log.info("logging to {}".format(self._stdout_file)) with open(self._stdout_file, "w", encoding="utf-8") as fd: self._process = yield from asyncio.create_subprocess_exec(*command, stdout=fd, stderr=subprocess.STDOUT, cwd=self._working_dir, env=env) log.info("ubridge started PID={}".format(self._process.pid)) except (OSError, subprocess.SubprocessError) as e: ubridge_stdout = self.read_stdout() log.error("Could not start ubridge: {}\n{}".format(e, ubridge_stdout)) raise UBridgeHypervisor("Could not start ubridge: {}\n{}".format(e, ubridge_stdout)) def _termination_callback(self, returncode): """ Called when the process has stopped. :param returncode: Process returncode """ log.info("uBridge process has stopped, return code: %d", returncode) if returncode != 0: self._project.emit("log.error", {"message": "uBridge process has stopped, return code: {}\n{}".format(returncode, self.read_stdout())}) @asyncio.coroutine def stop(self): """ Stops the uBridge hypervisor process. """ if self.is_running(): log.info("Stopping uBridge process PID={}".format(self._process.pid)) yield from UBridgeHypervisor.stop(self) try: yield from wait_for_process_termination(self._process, timeout=3) except asyncio.TimeoutError: if self._process.returncode is None: log.warn("uBridge process {} is still running... killing it".format(self._process.pid)) self._process.kill() if self._stdout_file and os.access(self._stdout_file, os.W_OK): try: os.remove(self._stdout_file) except OSError as e: log.warning("could not delete temporary uBridge log file: {}".format(e)) self._started = False def read_stdout(self): """ Reads the standard output of the uBridge process. Only use when the process has been stopped or has crashed. """ output = "" if self._stdout_file and os.access(self._stdout_file, os.R_OK): try: with open(self._stdout_file, "rb") as file: output = file.read().decode("utf-8", errors="replace") except OSError as e: log.warn("could not read {}: {}".format(self._stdout_file, e)) return output def is_running(self): """ Checks if the process is running :returns: True or False """ if self._process and self._process.returncode is None: return True return False def _build_command(self): """ Command to start the uBridge hypervisor process. (to be passed to subprocess.Popen()) """ command = [self._path] command.extend(["-H", "{}:{}".format(self._host, self._port)]) if log.getEffectiveLevel() == logging.DEBUG: command.extend(["-d", "2"]) return command